#include<......>
#define int long long
#define fo(i,a,b) for(int i=a;i<=b;i++)
using namespace std;
int n,a[11],ans;
int f[101];
main(){
	memset(f,0x3f,sizeof(f));
	f[0]=0;
	fo(i,1,10) cin>>a[i];
	cin>>n;
	fo(i,1,100){
		fo(j,1,10){
			if(i>=j){
				f[i]=min(f[i],f[i-j]+a[j]);
			}
		}
	}
	cout<<f[n];
	return 0;
}